Nobody writes letters anymore...except to themselves. One of the more interesting web phenomena is FutureMe.org, a site where you can write a letter to your future self and store it to be delivered anytime between a month and fifty years from now.
An article by J. R. Moehringer in the Los Angeles Times says that since the site was launched four years ago, it has received almost 400,000 e-mails and millions of hits. You can specify whether you want your message to be public (although without your name revealed) or private. Reading the public ones makes you laugh--and sometimes cry. The whole gamut of human emotions is there, aimed at ourselves: love, hate, fear, hope, despair.
Later this year, there will be a book collection of 200 of the public messages, edited by the founders of the site, Matt Sly and Jay Patrikios.
The article suggests one thing the founders might write if they were posting a letter to their past selves: "Dudes, you gotta charge for this thing, it's going to be huge!" (The site is free.)